Stairway.



C. ITSCHNER.

STAIRWAY.

APPLICATION FILED MAY l0. 1917.

1,291,904. Patented 3111.211919.

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UNITED STATES PATENT OFFICE.

CHARLES ITSCHNER, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO FRANKLINIP. SMITH, 0F CHICAGO, ILLINOIS.

STAIRWAY.

Specification of Letters Patent.

Patented Jan. 21, 1919.

Application led May 10, 1917. Serial No. 167,639.

To all whom t may concern:

Be it known that I, CHARLES ITsoHNER, a citizen of the United States,and a resident of Chicago, county of Cook, and State of Illinois, haveinvented certain new and useful Improvements in Stairways, of which thefollowing is declared to be a full, clear, and exact description.

This invention relates to stairways, and its principal object is toprovide a stairway of simple, substantial and fire proof construction.Another object is to provide a combined metal and concrete stairway, themetal portion of which may be assembled at the factory and erected atthe building where it is to be used. Another object is to provide astairway with a flat soflit which forms part of the vertical members ofthe stairway. With these and other advantages in view, this inventionconsists in the several novel features hereinafter set forth andclaimed.

The invention is clearly illustrated in the accompanying drawings, inwhich:

Figure 1, is a vertical, longitudinal section through a fragment of astairway, landing and post, embodying the preferred form of theinvention; Fig. 2, is a cross section taken on line 2-2 of Fig. 1; andFig. 3, is a vertical, longitudinal section of a fragment of the metalparts of the stairway.

Referring to said drawings, the reference character 8, designates alanding place or floor of a building, from which runs a flight of stairshaving the usual balustrade (not shown). In its preferred form, thestairs comprise a flat sheet metal soffit 11, having upwardly bent sideportions that form the stringers 12, 13. For obtaining greater strength,the upper edges of the stringers are bent outward to provide flanges 14,15, to one of which the balusters may be secured.

Conveniently the soflit 11, may be made of two metal sheets, runninglengthwise from top to bottom of the stairway, and secured together by aT-iron bar 16, riveted or otherwise fastened thereto. Obviously thevertical web of the T-iron bar stifl'ens the structure, and additionalreinforcement rods 17, run lengthwise of the sofiit, and are embedded inthe concrete filler, as will appear presently.

The risers 18, are preferably made of sheet metal, although notnecessarily so, and each is formed with the usual nosing 19, at the topand with flanged upper and lower edges, the ianges 20, being flush withthe tread 22, of one step and the flange 21, being flush with the treadof the next step t-herebelow. The risers are secured to the stringers byangle iron brackets 24, bolted or riveted to the ends of the risers andsides of the stringers. Conveniently stay rods 23, connect the upperportions of the risers with the sotlit to hold the risers in placebefore the concrete is filled in.

The concrete filler is shown in Figs. 1 and 2, and between the opposingflanges 20, 21, it is leveled oil' to provide the treads 22. A strip 25,is secured to the underside of the soflit at the side adjacent the wall26, of the building, and closes the space between the soilit and wall.

More or less variation ofthe exact details of construction is possiblewithout departing from the spirit of this invention; I desire,therefore, not to limit myself to the exact forms of the constructionshown and de scribed, but intend in the following claims to point outall of the invention disclosed herein.

I claim as new, and desire to secure by Letters Patent:

1. In a stairway, a flat sheet metal soiiit, having upturned stringersformed integral therewith, sheet metal risers secured to said stringers,the lower edges of said risers being spaced from said soiiit, lengthwiseextending reinforcement rods between said soliit and risers, and aconcrete filler.

2. In a stairway, a flat sheet metal solit having upturned stringersformed integral therewith, said stringers being formed with out-turnedflanges at their upper edges, metal risers secured to said stringers,the lower edges of said risers being spaced from said softit, lengthwiseext-ending metal reinforcement rods between said sotlt and risers, and aconcrete filler.

3. In a stairway, a flat sheet metal soft having upturned stringersformed integral die of the stairway by a T-iron bar, and therewith,risers secured to said stringere having integral upturned stringere,metal and forined with top ind bottom iisinges risers secured t0 saidstringere, lengthwise 10 projecting in opposite directions flush withextending reinforcement rods between the 5 two treads. soiit and risers,and a concrete filler.

4. In a stairway, a Hat sheet metal soit, composed of two sheets unitedat the mid- CHAS. ITSCHNER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Wgshington, D. C.

